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HistoryManager methods overview

add()Adds a new state
disable()Blocks HistoryManager
enable()Restarts the work of HistoryManager, saving the current state as initial state
isRedo()Checks whether the current HistoryManager state is in the ending state
redo()Takes a step forward in the history of changes
reset()Resets previous changes and saves the current state
undo()Takes a step back in the history of changes